Girls, what is the most comfy bra?

I would like to buy my girlfriend a set of bras to wear everyday. They don't need to be sexy or particular fashion, but she's always complaining that her bras are uncomfy I would like to buy her a new set of them that has to make are super comfy everytime! I know her measure that should be like 32B. What do you suggest, I cannot buy sport bras because she has to wear under a shirt or work dresses.Thank you!